:root {
    --primary: #004b87;
    --secondary: #ff9800;
    --text: #333;
    --light: #f9f9f9;
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Hind Siliguri', sans-serif; scroll-behavior: smooth; }
body { color: var(--text); line-height: 1.6; }
.container { width: 90%; max-width: 1100px; margin: auto; }
.header { background: #fff; padding: 15px 0; box-shadow: 0 2px 5px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
.header .container { display: flex; justify-content: space-between; align-items: center; }
.logo { color: var(--primary); font-size: 28px; font-weight: 700; text-transform: uppercase; }
.nav-links { list-style: none; display: flex; gap: 20px; }
.nav-links a { text-decoration: none; color: var(--text); font-weight: 600; font-size: 16px; transition: color 0.3s; }
.nav-links a:hover { color: var(--primary); }

.hero { 
    position: relative;
    background: url('https://images.unsplash.com/photo-1541336032412-2048a678540d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat; 
    height: 85vh; 
    display: flex; 
    align-items: center; 
    justify-content: center;
    text-align: center; 
    color: #fff; 
}
.hero-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 75, 135, 0.75);
    z-index: 1;
}
.hero-content { position: relative; z-index: 2; max-width: 800px; padding: 0 20px; }
.hero h2 { font-size: 48px; margin-bottom: 15px; font-weight: 700; }
.hero p { font-size: 22px; margin-bottom: 30px; font-weight: 400; }

.btn { display: inline-block; padding: 14px 35px; background: var(--secondary); color: #fff; text-decoration: none; border-radius: 5px; font-size: 18px; font-weight: bold; border: none; cursor: pointer; transition: 0.3s;}
.btn:hover { background: #e68a00; transform: translateY(-2px); }

.section { padding: 80px 0; }
.section h2 { text-align: center; font-size: 32px; margin-bottom: 40px; color: var(--primary); font-weight: 700; }
.bg-light { background: var(--light); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.card { background: #fff; padding: 40px 20px; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); text-align: center; border-bottom: 4px solid var(--primary); transition: transform 0.3s; }
.card:hover { transform: translateY(-5px); }
.card .icon { font-size: 40px; margin-bottom: 15px; }
.card h3 { margin-bottom: 15px; color: var(--primary); font-size: 22px; }

.contact-form { max-width: 600px; margin: auto; background: #fff; padding: 40px; border-radius: 10px; box-shadow: 0 5px 20px rgba(0,0,0,0.08); }
.form-group { margin-bottom: 20px; text-align: left; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--text); }
.form-group input { width: 100%; padding: 12px; border: 1px solid #ddd; border-radius: 5px; font-size: 16px; transition: border 0.3s; }
.form-group input:focus { border-color: var(--primary); outline: none; }
.btn-submit { width: 100%; margin-top: 10px; }
.alert-success { background: #d4edda; color: #155724; padding: 20px; border-radius: 5px; text-align: center; margin-bottom: 20px; font-weight: bold; font-size: 18px; border: 1px solid #c3e6cb; }

footer { background: #1a1a1a; color: #fff; text-align: center; padding: 25px 0; font-size: 15px; }

@media(max-width: 768px){
    .hero h2 { font-size: 32px; }
    .nav-links { display: none; /* Add JS for hamburger menu if needed, keeping simple for now */ }
}